Various Sizes: This set includes 4 taper drill bits and 4 claw drill bits to meet your daily working needs. Each shape has four sizes, 1/4", 3/8", 1/2", 5/8" (6mm / 10mm / 13mm / 16mm). Rod Diameter: Approx. 9.5mm. High quality carbon steel: the wood plug cutter set is made of carbon steel, which is durable and corrosion resistant, high precision, high strength and with a smooth surface. Practical features: 4-tooth chamfer punches make taper plugs for filling router bits, while standard punches are used to remove defects in wood. Applications wide: suitable for bench and hand drills, we recommend using bench drills for more stable operation and improved work efficiency. Note: the speed should not be too fast, because it is easy to produce smoke, burns, etc.